Hi guys, I tried exploding the walls (since I have grouped them into components earlier) and it works out well! Although there are still faint splotches on the 2nd & 3rd blocks from the left. I am guessing that it might have been a SU bug? I have another question: how do i make the yellow roof (supposedly perforated metal roof) more porous? cause it seems to me now that they are still somewhat opaque from far. (not much light passing through) I have included the bump map for rendering but whenever I have changed the porosity sizes (on SU paint material setting) I would have to alter the corresponding bump map on photoshop before loading it on vray material editor. Is there a faster way of doing this? Many thanks! -) [image: LYpV_Compare.jpg]